Two-Chamber Ampoule Injection Device with Traction Cable Mixing
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Solution Overview
Problem
Current injection devices for two-chamber ampoules require manual control and lack automation for mixing and needle withdrawal, making them cumbersome and unsafe for patients, especially when administering two-component substances that require precise dosing and insertion depth.
Innovation Solution
A traction-cable system drives the sequence of strokes, dividing the process into mixing, insertion, and injection, with independent adjustments for insertion depth and injection volume, ensuring the needle is inserted only after mixing and automatically withdrawn, enhancing handling comfort and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual control is used for mixing and needle withdrawal, then device complexity is reduced, but ease of operation and patient safety deteriorate
Solution Approach 1:
The injection process is segmented into distinct phases (mixing stroke, insertion stroke, injection stroke, withdrawal stroke) controlled by separate adjusting elements. This segmentation allows automatic control of complex sequences while maintaining manageable device structure through modular adjustment mechanisms.
Solution Approach 2:
The device employs dynamic adjustment elements that can be independently positioned to control different phases of the injection process. The adjusting elements dynamically regulate the tappet's movement to achieve precise control over mixing duration, insertion depth, and injection volume without requiring complex fixed mechanisms.
2Extent of automation
If automation is introduced for mixing and needle withdrawal, then ease of operation improves, but device complexity increases
Solution Approach 1:
The tappet serves multiple functions: it mixes the active substances, inserts the needle, delivers the injection, and enables withdrawal. This multi-functionality reduces the need for separate automated mechanisms for each phase, thereby limiting complexity increase while achieving high automation extent.
Solution Approach 2:
The adjusting elements are pre-positioned before the injection process to predetermined positions that automatically control the duration and parameters of each stroke phase. This preliminary action eliminates the need for complex real-time control mechanisms during operation.
3Adaptability or versatility
If independent adjustment of insertion depth and injection volume is provided, then adaptability improves, but device complexity increases
Solution Approach 1:
Different adjusting elements are assigned to control specific parameters: one adjusting element controls insertion depth while another controls injection volume. This local specialization allows independent adjustment of each parameter without requiring a complex integrated control system.
Solution Approach 2:
The adjusting elements provide adjustment ranges that may exceed minimum requirements, allowing individual patient dosing needs to be met with a standardized device design, thereby achieving high adaptability without increasing device complexity.
Data Source
AI summary
An injection device for holding and activating a two-chamber ampulla has components whose relative movement causes the pistons of the two-chamber ampulla to be moved in order to mix the substances, as well as devices for injecting the product which is mixed in this way. For this purpose, a receptacle (103) into which the two-chamber ampulla (111) can be inserted and secured is held in a housing (101), and the receptacle (103) can be displaced by means of a carriage (108). A tappet (104) which acts on the pistons (111A, 111B) is movably held in the receptacle (103). A traction cable (114) which is deflected by means of a roller (109) which is mounted on the carriage (108) and one of whose ends is connected to the receptacle (103) and the other end of which is connected to a tension spring (110) which is held on the housing (101) is provided in order to carry out a mixing stroke, insertion stroke, injection stroke and a return stroke. Devices which can be activated automatically and/or manually between the housing (101), receptacle (103), tappet (104) and carriage (108) control their alternating coupling to the traction cable (114) and thus the sequence of the mixing stroke, insertion stroke, injection stroke and return stroke. The invention thus provides a partially automatic injection device for two-chamber ampullas whose handling comfort and safety for the patient are substantially improved.